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(No Model.) 2 Sheets-Sheet 2.

A. E. BURROWS. DAMPER REGULATOR.

No. 581,334. Patented Apr. 27, 1897.

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2 Sheets-Sheet 1.

(No Model.) A. E. BURROWS.

- DAMPER REGULATOR.

No. 581,334. Patented Apr. 27, 1897. I

UNITED STATES ATENT FFICE.

AMOS E. BURROWS, OF PICTURE BOOKS, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO ISAAC BARTON, OF WVILLIAMSPORT, PENNSYLVANIA.

DAM PER-REG U LATO R.

SPECIFICATION forming part of Letters Patent No. 581,334, dated April 27, 1897.

Application filed November 11, 1896. Serial No. 611,728. (No model.)

To all whom it may concern:

Be it known that I,AMOS E. BURROWS,a citizen of the United States, and a resident of Picture Rocks, Lycoming county, Pennsylvania,

have invented certain new and useful Improvements in Damper-Regulators, of which the following is a specification.

My invention relates to improvements in automatic damper regulating devices, and

more particularly to improvements in damper-regulating devices which are controlled by the pressure of steam in a steam-boiler or by a column of water which is acted upon by the steam in a boiler.

In the accompanying drawings, forming part of this specification and in which similar letters of reference indicate similar parts throughout the several views, Figure 1 is a central sectional elevation of my improved 2o damperoperating device, the levers being shown in elevation; Fig. 2, an enlarged central sectional elevation of the relief-valve; and Fig. 3, a side elevation of that part of the stack which carries the damper, showing the lever for operating the same; Fig. 4, a side elevation of my regulator, showing its attachment to a boiler, part of the latter and its stack being shown in side elevation.

A is a pipe which is connected with the steam or water space of a steam-boiler A or with a water-column, the liquid within which is acted upon by the steam in the boiler; B, a valve-chamber, the upper part of which is inclosed by a diaphragm O. The pipe A is 3 5 connected with the chamber within the valvecasing, as shown.

D is a rod or upright carried by diaphragm C, the upper end of which is formed into a knife-edge E.

0 F is a pipe, one end of which is connected centrally with the under part of valve-chamber B, and the other end of which connects with a hydraulic cylinder G, which is fitted with a piston II, the rod I of which is furnished at its upper end with a knife-edge J.

K is .a lever, one end of which is carried by a pivot or knife-edge M, carried by an arm IV, pivoted to a fixed support L N, a sliding weight upon the other end of this lever; O, a

lever pivoted to a fixed support P R, a sliding weight upon the other end of this lever.

The pipe A, as has before been stated, is

connected with the steam or water space of the boiler, or with the water in a water-column which is acted upon by the steam, and steam or water at the boiler-pressure is carried by this pipe to the chamber B. Should the steam-pressure in the boiler rise beyond a predetermined point, which is determined by the position of the weight N on the lever K, the diaphragm C, the lever K, and the weight N are lifted, and the valve a is opened and steam or water is admittedfrom chamber B to pipe F. In the drawings the valve a is a needle-valve, the needle or being carried by a bushing I), carried by the diaphragm O or by the under part of rod D, which is carried by the diaphragm. A spring a is used to press the point of the needle a against its seat. This spring prevents the needle from carrying an undue weight when the valve is closed.

The point of the needle a is adapted to engage a corresponding seat in a bushing d, which is adapted to be screwed into the basecasting T and to project up slightly above the top of this casting into the chamber B, 8 forming a lip e, which prevents sand or similar substances carried by the water into the chamber B from falling into the valve a or into the pipe F. The pipe F and the cylinder G contain water, which may be water of 0 condensation if steam be carried by pipe A, or if the pipe A carries water, which latter I prefer, the water would be furnished through this pipe. l/Vhen the steam in the boiler rises above the predetermined point, its pressure, 5 acting directly or through the water in pipe A and chamber B, lifts the diaphragm O and opens valve a, and the pressure of water or steam in chamber B now acting against the water in pipe F causes a certain amount of I00 water to be driven from this pipe into cylinder G and the piston H to be raised thereby.

As the piston H rises its rod I rises and lifts lever O, which latter, through a rod or chain f, lifts the outer end of a lever g, which is attached to and operates the damper 7L in the stack Y, Fig. 3. The damper is closed by the rising of the lever O to a great-er or less extent and checks the draft, and consequently the steam-pressure presently falls, and the needle a is by the lever K returned to its first or closed position. hen the lever K falls and closes the valve a, it engages and pushes down a rod 71/, Figs. 1 and 2, which passes into a casing i and rests upon a diskj, which is carried by or forms part of a stem 7:, the upper central part of which carries a conical point or needle Z, which is adapted to close a corresponding opening in a passage on, which passes through casing 'i, and one end of which connects with the interior of cylinder G and the other with the air.

at is a spring which when lever K is lifted lifts stem 7.; and causes cone or needle Zto shut cit passage M. \Vhen the lever K falls, as above stated, it pushes down rod h, which ongages diskj and pushes down rod K, causing the cone or needle Z to be moved away from its seat and the passage M to be opened. The liquid that is within the cylinder G and above the openingm now runs off through this opening, permitting the piston H to fall, and with it the lever O, and this latter, through the mechanism shown, opens the damper in the stack.

The end of the casin g L'that is screwed into the cylinder projects preferably slightly into the interior of the cylinder and forms a stop to prevent the piston II falling too low down. The upper end of the rod 71/ is formed by a cap 0, which is screwed on the rod, as shown. This cap may be turned, so as to adjust the length of rod h, as may be found necessary.

U, Fig. 1, is a set-screw carried by the base, casting T, which is adapted to engage and prevent the lever K from falling too low down; V, an adjustable stop carried by the base-casting T, the purpose of which is to limit the upward movement of lever O.

\V is an L-shaped lever which is pivoted at X to the standard L; Z, a set-screw carried by the lower arm of this lever.

As has been before stated, the lever K is suspended upon a knife-edge M, which is carried by lever W. By means of the screw Z the lower or vertical limb of lever XV may be moved in or out and the knife-edge M carried by the upper or horizontal limb of this lever, raisedor lowered, so as to adjust the lever K properly for engagement by the knife-edge E, carried by standard I).

Having thus described my invention, I claim- 1. In adampenregulator, in combination, a valve-chamber, a diaphragm closing the top of said chamber, a pipe connecting said cha1nb'er and the steam or water space of a steamboiler, an upwardly-projecting rod carried by said diaphragm, a valve the stem of which is carried by said diaphragm and which is opened when said diaphragm rises and closed when said diaphragm falls, a pipe leading from said pipe to a hydraulic cylinder, said cylinder, a piston and piston-rod within said cylinder, a weighted lever pivoted at one end and resting on said piston-rod, a weighted lever pivoted at one end and resting on the rod carried by said diaphragm, a damper, a connection between said damper and the free end of said former lever, a valve-casing connected to said hydraulic cylinder, a liquidpassage in said casing one end of which is connected to the interior of said cylinder and the other with the air, a stem within said passage, a needle or point carried by said stem, a spring for causing said point to close said liquid-passage when said latter lever rises, and a rod engaging said stem eccentrically the upper end of which is adapted to be engaged by and moved downward upon the falling of the lever carried by the rod on the diaphragm in order to move down said stem in said liquid-passage to open the same in order to permit escape of superfluous liquid, all substantially as and for the purposes set forth.

2. The combination in a relief-valve of a casing, a passage in said casing, a stem in said passage, a disk carried by said stem, a needle or cone shaped valve carried centrally by said disk, a spring for normally closing said valve, and a rod passing through said casing and engaging the top of said disk substantially as and for the purposes set forth. 

